CN110505933B - Cutting insert with two peripheral abutment ridges and cutting tool - Google Patents

Cutting insert with two peripheral abutment ridges and cutting tool Download PDF

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Publication number
CN110505933B
CN110505933B CN201880021122.5A CN201880021122A CN110505933B CN 110505933 B CN110505933 B CN 110505933B CN 201880021122 A CN201880021122 A CN 201880021122A CN 110505933 B CN110505933 B CN 110505933B
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China
Prior art keywords
insert
cutting
peripheral
abutment
ridge
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Active
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CN201880021122.5A
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Chinese (zh)
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CN110505933A (en
Inventor
奥列格·克尔茨曼
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Iscar Ltd
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Iscar Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/04—Cutting-off tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • B23B27/1614—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert
    • B23B27/1622—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert characterised by having a special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/0423—Irregular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B23B2200/123—Side or flank surfaces curved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2205/00—Fixation of cutting inserts in holders
    • B23B2205/12—Seats for cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Milling Processes (AREA)
  • Knives (AREA)

Abstract

A cutting insert includes an insert longitudinal axis defining a front-to-rear direction, opposing insert inside and outside surfaces, and an insert peripheral surface extending therebetween. The insert peripheral surface includes an insert rear end surface and an adjoining insert lower surface. The cutting insert includes two peripheral abutment ridges spaced apart on a distal side of the insert outer side surface and extending along the insert rear end surface and the insert lower surface, respectively. The two peripheral abutment ridges converge towards each other in a rearward direction of the cutting insert away from the cutting edge at an acute insert wedge angle.

Description

Cutting insert with two peripheral abutment ridges and cutting tool
Technical Field
The subject matter of the present application relates to cutting tools, in particular to cutting tools for grooving and parting off, and in particular also to cutting tools for face grooving of the type in which the cutting insert is removably attached to the insert holder by means of a fastening member.
Background
A cutting tool for grooving metalworking operations may include a cutting insert removably attached to an insert holder. More specifically, the insert holder has a lateral insert pocket, and the cutting insert is releasably retained in the insert pocket.
During the metalworking operation, a cutting force is exerted on the cutting insert at the cutting edge. The direction of the cutting force is substantially downward and slightly inward toward the central body. The cutting force creates a moment about a pivot point, which is typically the forwardmost point of abutment between the lower surface of the cutting blade and the lower support surface of the blade holder. The moment forces the cutting insert to rotate about the pivot point in a direction of rotation. In order to prevent rotational displacement of the cutting insert, the insert pocket has at least one peripheral wall abutment surface projecting from the pocket bottom surface and facing in the direction of rotation.
In some such cutting tools, the peripheral contact between the peripheral surface of the cutting insert and the abutment surface of the peripheral wall of the insert pocket is plane-to-plane. Examples of such cutting tools are disclosed in, for example, US4,890,961, US6,000,885, US7,094,006B2, US7,726,218B2 and US8,747,032B2.
It is an object of the subject matter of the present application to provide a new and improved cutting insert.
It is another object of the subject matter of the present application to provide a new and improved cutting tool.
It is a further object of the subject matter of the present application to provide a new and improved connection of replaceable cutting inserts in insert holders.
It is a further object of the subject matter of the present application to provide a connection wherein the force applied to the abutment surface of the peripheral wall of the insert pocket is near the pocket bottom surface.
Disclosure of Invention
According to a first aspect of the subject matter of the present application, there is provided a replaceable cutting insert having an insert longitudinal axis defining opposite forward and rearward directions, and further having an insert axial plane containing the insert longitudinal axis, the cutting insert comprising:
opposed blade inner and outer side surfaces and a blade peripheral surface extending therebetween, the blade peripheral surface including opposed blade front and rear end surfaces and opposed blade upper and lower surfaces connecting the blade front and rear end surfaces;
a cutting portion including a primary cutting edge formed at an intersection of an insert nose surface and an insert upper surface; and
a mounting portion connected to the cutting portion and comprising:
two peripheral abutment ridges spaced apart, located on a distal side of the insert outside surface, and extending along the insert rear end surface and the insert lower surface, respectively, and converging toward each other in a rearward direction of the cutting insert away from the main cutting edge at an acute insert wedge angle.
According to a second aspect of the subject matter of the present application, there is also provided a cutting tool comprising, in combination:
a blade holder having a holder longitudinal axis; and
a cutting insert of the above type, which is removably attached to an insert holder by means of a fastening member.
It should be understood that the above is a summary and that the features described hereinafter may be applicable to the subject matter of the present application in any combination, e.g., any of the following features may be applicable to a cutting insert or a cutting tool.
Each peripheral abutment ridge may be closer to the insert inside surface than to the insert outside surface.
An insert axial plane passes between the insert inside surface and the insert outside surface and also passes through the main cutting edge. Each peripheral abutment ridge may lie in a ridge plane that is parallel to and spaced from the insert axial plane by a constant ridge distance.
In a cross-section taken in a plane perpendicular to and passing through the longitudinal extension of each peripheral abutment ridge, an imaginary tangent to the peripheral abutment ridge may form an acute internal ridge angle with the insert inner side surface.
The imaginary tangent line may not intersect any other point on the outer peripheral surface of the insert.
Each peripheral abutment ridge may be convexly curved in a direction from the insert inside surface to the insert outside surface.
Each peripheral abutment ridge may be defined by an imaginary cylinder having a ridge radius. The ridge radius can be within the range of R being more than or equal to 0.25mm and less than or equal to 0.75 mm.
The ridge radius may be equal to 0.5 mm.
Each peripheral abutment ridge may be spaced from the insert outboard surface by an outer relief surface. The outer relief surface may be planar and inclined outwardly in a direction from the insert outer side surface toward the insert inner side surface.
The outer relief surface may form an acute inner outer relief angle with the insert inner side surface.
The external relief angle can be in the range of beta being more than or equal to 60 degrees and less than or equal to 65 degrees.
Each peripheral abutment ridge may be spaced from the insert inner side surface by an inner relief surface. The inner relief surface may be planar.
The inner relief surface may be perpendicular to the insert inside surface.
The inner relief surface may have an inner relief surface width. The width of the inner relief surface can be within the range of W being more than or equal to 0.5mm and less than or equal to 0.9 mm.
Each peripheral abutment ridge may extend to the insert inner side surface.
The cutting insert may be non-indexable.
The insert inner side surface may include an inner lateral surface extending midway along the insert longitudinal axis between the insert upper surface and the insert lower surface and oriented transverse to the insert longitudinal axis, the inner lateral surface defining a cutting portion and a mounting portion.
The mounting portion may include an insert through bore passing through the insert inside surface and the insert outside surface along a through bore axis.
In a top view of the cutting insert:
the mounting portion has a mounting portion width measured in a direction perpendicular to the axial plane of the insert. The cutting portion has a cutting portion width measured in a direction perpendicular to the axial plane of the insert. The cutting portion width may be less than the mounting portion width.
In a top view of the cutting insert:
the mounting portion has a mounting portion length measured along the blade longitudinal axis. The cutting portion has a cutting portion length measured along the blade longitudinal axis. The cutting portion length may be greater than the mounting portion length.
The insert inner side surface may include three spaced apart insert protrusions protruding therefrom at the mounting portion, each insert protrusion may include an inner abutment surface, and the inner abutment surfaces may be coplanar with one another.
The insert inside and outside surfaces may be curved at the cutting portion in a front view of the cutting insert.
The forward portion of the upper surface of the insert may be inclined in a forward direction toward the longitudinal axis of the insert. The main cutting edge may be located at a middle portion of the cutting insert in a height direction of the cutting portion.
The mounting portion may be free of any abutment surfaces on the insert front end surface and the insert upper surface.
The cutting insert may include a mounting portion outer peripheral ridge located on a distal side of the insert outer side surface and extending continuously in a peripheral direction along the entire insert peripheral surface of the cutting insert at the mounting portion. Two peripheral abutment ridges may be formed on the mounting portion outer peripheral ridge.
The insert inner side surface may include three spaced apart insert protrusions protruding therefrom at the mounting portion, each insert protrusion including an inner side abutment surface. The two peripheral abutment ridges may include a lower peripheral abutment ridge on the lower insert surface and a rear peripheral abutment ridge on the rear insert end surface. The blade mount may include:
a stent front end surface and a stent outer peripheral surface forming a circumferential boundary thereof; and
an insert pocket recessed in the holder outer peripheral surface and including:
a slot opening that opens toward the bracket toward the front end surface; and
a pocket bottom surface and a pocket peripheral wall surface oriented substantially perpendicular to the pocket bottom surface, the pocket bottom surface including a pocket side abutment surface and the pocket peripheral wall surface including a pocket rear abutment surface and a pocket lower abutment surface, the pocket rear abutment surface and the pocket lower abutment surface being inclined outwardly in a direction from the bracket peripheral surface toward the pocket bottom surface and converging toward each other at an acute pocket wedge angle in a direction away from the pocket opening; wherein in the assembled position of the cutting tool:
the under-groove abutment surface may abut the lower outer peripheral abutment ridge, the behind-groove abutment surface may abut the behind-outer peripheral abutment ridge, and the groove-side abutment surface may abut the insert inner side surface.
The groove lower abutment surface and the groove rear abutment surface may be closer to the groove bottom surface than to the bracket outer peripheral surface.
The mounting portion may include an insert through bore passing through the insert inside surface and the insert outside surface along a through bore axis. The groove bottom surface can include a threaded groove hole. The fastening member may be a set screw located in the insert through bore and threadedly engaged with the threaded slot bore.
The insert upper surface may be spaced from the pocket peripheral wall surface.
The insert wedge angle may be greater than the acute slot wedge angle.
Drawings
For a better understanding of the present application and to show how the same may be carried into effect, reference will now be made to the accompanying drawings, in which:
FIG. 1 is an exploded perspective view of a cutting tool showing a cutting insert and an insert pocket of an insert holder;
FIG. 2 is an outside view of the cutting insert shown in FIG. 1;
FIG. 3 is an inside view of the cutting insert shown in FIG. 2;
FIG. 4 is a top view of the cutting insert shown in FIG. 2;
FIG. 5 is a bottom view of the cutting insert shown in FIG. 2;
FIG. 6 is a front view of the cutting insert shown in FIG. 2;
FIG. 7 is a perspective view of the insert pocket shown in FIG. 1;
FIG. 8 is a side view of the insert pocket shown in FIG. 1 with a cutting insert releasably retained therein;
FIG. 9 is a portion of a cross-sectional view taken along line IX-IX shown in FIG. 8; and
fig. 10 is a detail of fig. 9.
It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity, or several physical components may be included in one functional block or element. Where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.
Detailed Description
In the following description, various aspects of the subject matter of the present application will be described. For purposes of explanation, specific configurations and details are set forth in sufficient detail to provide a thorough understanding of the subject matter of the present application. However, it will also be apparent to one skilled in the art that the subject matter of the present application may be practiced without the specific configurations and details presented herein.
Attention is first drawn to fig. 1, which shows a cutting tool 20 of the type for grooving, more precisely for face grooving, according to an embodiment of the subject matter of the present application. The cutting tool 20 has a replaceable cutting insert 22 and an insert holder 24. The cutting tool 20 is adjustable between an assembled position and an unassembled position. In the assembled position of the cutting tool 20, the cutting insert 22 is removably retained in the insert pocket 26 of the insert holder 24.
The insert holder 24 may be made of a first hard material and the cutting insert 22 may be made of a second hard material that is harder than the first hard material. For example, the insert holder 24 may be made of steel and the cutting insert 22 may be made of cemented carbide.
Referring to fig. 2-6, a first aspect of the subject matter of the present application relates to a cutting insert 22. The cutting insert 22 has an insert longitudinal axis A defining an opposite forward direction DFAnd a backward direction DR. The cutting insert 22 includes opposing insert inside and outside surfaces 28, 30 and an insert peripheral surface 32 extending therebetween. The insert peripheral surface 32 includes opposing insert forward and rear end surfaces 34, 36 connecting opposing insert upper and lower surfaces 38, 40. The insert rear end surface 36 abuts the insert lower surface 40. The insert longitudinal axis a intersects the insert rear end surface 36 and passes between the insert upper surface 38 and the insert lower surface 40. Generally, the insert longitudinal axis a may also intersect the insert forward end surface 34. It should be noted, however, that the forward portion 38a of the insert upper surface 38 may be in the forward direction D, as is known in the face grooving artFAngled toward the blade longitudinal axis a (as shown in fig. 2). In such a configuration, the insert longitudinal axis a may intersect the insert upper surface 38 rather than the insert forward end surface 34. The cutting insert 22 has an insert central axis C. The insert peripheral surface 32 extends circumferentially about the insert central axis C and faces away from the insert central axis C. The insert central axis C may be in contact withThe blade longitudinal axis a intersects and may be perpendicular thereto. The cutting insert 22 has an insert axial plane P that contains the insert longitudinal axis a and passes between the insert inside surface 28 and the insert outside surface 30. The insert axial plane P also passes through the major cutting edge 48. The insert axial plane P may be perpendicular to the insert central axis C.
It should be noted that the terms "forward" and "rearward" are used throughout the description and claims to refer to relative positions toward the left and right sides, respectively, in the direction of the blade longitudinal axis a in fig. 2-6. In the present disclosure, "forward" is associated with the cutting end of the cutting tool 20. It should also be noted that the terms "upward" and "downward" are used throughout the specification and claims to refer to relative positions in fig. 2 and 3 toward the top and bottom, respectively, in a direction perpendicular to the longitudinal axis a of the blade.
The cutting insert 22 includes a cutting portion 42 and a mounting portion 44 connected to the cutting portion 42. The cutting insert 22 may be non-indexable, i.e., single-ended, with only one cutting portion 42 located at the front end of the cutting insert 22 and a mounting portion 44 located at the rear end of the cutting insert 22.
Referring particularly to fig. 4 and 5, in accordance with some embodiments of the present subject matter, the insert inner side surface 28 may include an inner lateral surface 46 that may extend between the insert upper surface 38 and the insert lower surface 40 and be positioned medially along the insert longitudinal axis a. The inner lateral surface 46 may be oriented transverse, preferably perpendicular, to the blade longitudinal axis a. The inboard transverse surface 46 may define the cutting portion 42 and the mounting portion 44. In a top view of the cutting insert 22 (i.e., fig. 4), the mounting portion 44 has a mounting portion width W measured in a direction perpendicular to an insert axial plane P between the insert inside surface 28 and the insert outside surface 30M. The cutting portion 42 has a cutting portion width WCWhich is also measured in a direction perpendicular to the insert axial plane P between the insert inside surface 28 and the insert outside surface 30. Width W of cutting portionCMay be smaller than the mounting portion width WM. Moreover, in a top view of the cutting insert 22, the mounting portion 44 has a mounting dimension measured along the insert longitudinal axis ALength L of the mounting partM. Likewise, the cutting portion 42 has a cutting portion length L measured along the blade longitudinal axis AC. Cutting portion length LCMay be greater than the mounting portion length LM. The cutting portion 42 has a cutting portion height HCMeasured in a direction perpendicular to the insert longitudinal axis a in a view along the insert central axis C.
Referring now to fig. 4, the cutting portion 42 includes a primary cutting edge 48 formed at the intersection of the insert forward end surface 34 and the insert upper surface 38 for nicking/parting metal cutting operations. In accordance with some embodiments of the subject matter of the present application, the cutting portion 42 may further include two minor cutting edges 50 formed at the intersection of the insert upper surface 38 with the insert inner and outer side surfaces 28, 30, respectively, and projecting from both sides of the major cutting edge 48 for slot-turning metal cutting operations.
Referring to fig. 6, in accordance with some embodiments of the present subject matter, in a front view of the cutting insert 22, the insert inside surface 28 and the insert outside surface 30 may be curved at the cutting portion 42 to allow for face grooving for radiused grooves. Advantageously, as previously described, the forward portion 38a of the insert upper surface 38 may be in the forward direction DFIs inclined toward the insert longitudinal axis a such that the major cutting edge 48 is located at a middle portion of the cutting insert 22 in the height direction of the cutting portion 42.
In accordance with some embodiments of the present subject matter, the mounting portion 44 may include an insert through bore 52 passing through the insert inner side surface 28 and the insert outer side surface 30 along the through bore axis T. The through hole axis T may be aligned with the insert central axis C. As best shown in fig. 4 and 5, the insert inner side surface 28 at the mounting portion 44 may be planar. Referring to fig. 3, the insert inside surface 28 at the mounting portion 44 may include three spaced apart insert protrusions 54 protruding therefrom. The insert protrusions 54 may be angularly spaced about the insert through bore 52. Each insert protrusion 54 may include an inboard abutment surface 56 designed to abut a corresponding abutment surface in the insert pocket 26. The inboard abutment surfaces 56 may be coplanar with one another.
The mounting portions 44 include spaced apartTwo peripheral abutment ridges, a rear peripheral abutment ridge 58 on the insert rear end surface 36 and a lower peripheral abutment ridge 60 on the insert lower surface 40. The two peripheral abutment ridges 58, 60 are configured to abut respective abutment surfaces in the insert pocket 26. The peripheral abutment ridges 58, 60 are each located on a distal side of the insert outer side surface 30. The two peripheral abutment ridges 58, 60 are in the rearward direction D of the cutting insert 22RThe upper away from the main cutting edge 48 converge toward each other at an acute insert wedge angle theta. According to some embodiments of the subject matter of the present application, the wedge angle θ can be in the range of 45 ° ≦ θ ≦ 55 °. Preferably, the wedge angle θ may have a value of 50 °. The mounting portion 44 may be devoid of any abutment surfaces on the insert forward end surface 34 and the insert upper surface 38. The peripheral abutment ridges 58, 60 each project outwardly relative to an imaginary line IL drawn between the insert peripheral surface 32 and the intersection between the insert inner and outer side surfaces 28, 30, respectively.
In this non-limiting example shown in the drawings (e.g., fig. 2), the cutting insert 22 may include a mounting portion peripheral ridge 62 that extends continuously in a peripheral direction along the entire insert peripheral surface 32 of the cutting insert 22 at the mounting portion 44. The two peripheral abutment ridges 58, 60 may be formed on the mounting portion peripheral ridge 62 and spaced apart from one another along the mounting portion peripheral ridge 62. Alternatively, the cutting insert 22 may include a plurality of spaced apart mounting portion peripheral ridges 62 extending along portions of the insert peripheral surface 32 of the cutting insert 22 at the mounting portion 44. In this configuration, the two peripheral abutment ridges 58, 60 may be formed on different mounting portion peripheral ridges 62 (not shown).
It should be noted that the term "peripheral direction" is used throughout the description and claims to refer to a direction around the insert central axis C, as shown in fig. 2.
In accordance with some embodiments of the present subject matter, the peripheral abutment ridges 58, 60 may each be positioned closer to the insert inside surface 28 than to the insert outside surface 30. The peripheral abutment ridges 58, 60 may each extend along a respective ridge axis RA. The peripheral abutment ridges 58, 60 may each lie in a common ridge plane PRIn the ridge plane PRParallel to the axial direction of the bladePlane P and is spaced from the insert axial plane P by a constant ridge distance D. Thus, each ridge axis RA may be parallel to the insert inside surface 28.
As shown in fig. 6, in accordance with some embodiments of the present subject matter, the peripheral abutment ridges 58, 60 may each be spaced from the insert outboard surface 30 by an outer relief surface 64. The outer relief surface 64 may be planar. The outer relief surface 64 may slope outwardly, i.e., away from the insert central axis C, in a direction from the insert outer side surface 30 toward the insert inner side surface 28. That is, referring now to fig. 9, the outer relief surface 64 may form an acute inner outer relief angle β with the insert inboard surface 28. The external relief angle beta can be within the range of beta being more than or equal to 60 degrees and less than or equal to 65 degrees. Note that fig. 9-10 relate to cross sections taken through either the rear or lower peripheral abutment ridge 58, 60.
In accordance with some other embodiments of the present subject matter, the peripheral abutment ridges 58, 60 may each be spaced from the insert inboard surface 28 by an inner relief surface 66. In this configuration, the peripheral abutment ridges 58, 60 are each formed at the intersection of the outer and inner relief surfaces 64, 66. The inner relief surface 66 may be planar and may be perpendicular to the insert inboard surface 28. Referring to fig. 10, the inner relief surface 66 may have an inner relief surface width W. The width W of the internal relief surface can be in the range of 0.5mm to 0.9 mm.
In accordance with some embodiments of the present subject matter, in a cross-section taken in a plane perpendicular to and passing through the longitudinal extension of each peripheral abutment ridge 58, 60 (i.e., fig. 9 and 10), an imaginary tangent line L tangent to the peripheral abutment ridge 58, 60 may form an acute internal ridge angle α with the insert inner side surface 28. The imaginary tangent line L may not intersect any other point on the insert peripheral surface 32. As shown in fig. 9, the peripheral abutment ridges 58, 60 may each be convexly curved in a direction from the insert inner side surface 28 to the insert outer side surface 30. Thus, the insert peripheral surface 32 approaches the insert central axis C as it extends from the insert inner side surface 28 toward the insert outer side surface 30.
The peripheral abutment ridges 58, 60 may each be defined by an imaginary cylinder having a ridge radius R. The ridge radius R can be within the range of 0.25mm < R < 0.75 mm. Preferably, the ridge radius R may be equal to 0.5 mm. An imaginary cylinder with a lower outer periphery abutting the ridge 60 has an axis which may be co-directional with the blade longitudinal axis a.
A second aspect of the subject matter of the present application relates to a cutting tool 20 comprising a cutting insert 22 as described above and an insert holder 24. Referring now to fig. 7, a blade holder 24 having a holder longitudinal axis B is shown. The holder longitudinal axis B may extend in the same direction as the blade longitudinal axis a. The blade holder 24 has a holder forward end 68. The blade carrier 24 includes a carrier forward end surface 70 formed at the carrier forward end 68, and a carrier peripheral surface 72, wherein the carrier peripheral surface 72 forms a circumferential boundary of the carrier forward end surface 70.
In this non-limiting example shown in the drawings, the holder peripheral surface 72 may be cylindrical, in which case there is only one continuous surface, the holder peripheral surface 72. However, it should be understood that the holder peripheral surface 72 may include a plurality (e.g., four) of holder peripheral sub-surfaces.
The insert pocket 26 is recessed into the holder peripheral surface 72 and includes a pocket opening 74 that opens toward the holder forward end surface 70. The purpose of the insert pocket 26 is to receive the cutting insert 22 when the cutting insert 22 is removably attached to the insert holder 24. The insert pocket 26 includes a pocket bottom surface 76 and a pocket peripheral wall surface 78 oriented substantially perpendicular thereto. The pocket bottom surface 76 includes a pocket side abutment surface 80 for abutting a corresponding surface on the cutting insert 22. The insert pocket 26 has a pocket central axis E with a pocket peripheral wall surface 78 extending circumferentially around and facing the pocket central axis E. The slot central axis E may be perpendicular to the slot bottom surface 76. According to some embodiments of the present subject matter, the slot side abutment surface 80 may be planar. The trough bottom surface 76 may include a threaded slot 82. The threaded slot 82 is designed to provide a mechanism for removably attaching the cutting insert 22 to the insert holder 24.
The pocket peripheral wall surface 78 includes a pocket rear abutment surface 84 and a pocket lower abutment surface 86 for abutting corresponding surfaces on the cutting insert 22. The pocket rear abutment surface 84 and the pocket lower abutment surface 86 are inclined outwardly, i.e., away from the pocket central axis E, in a direction from the holder outer peripheral surface 72 toward the pocket bottom surface 76. That is, referring now to fig. 9, the slot aft abutment surface 84 and the slot lower abutment surface 86 may form an acute exterior slot side angle γ with the slot bottom surface 76. The slot side angle gamma may be greater than the inner outer relief angle beta. The pocket rear abutment surface 84 and the pocket lower abutment surface 86 converge toward each other at an acute pocket wedge angle μ in a direction away from the pocket opening 74. In accordance with some embodiments of the present subject matter, the pocket rear abutment surface 84 and the pocket lower abutment surface 86 may be planar. The slot lower abutment surface 86 and the slot rear abutment surface 84 may be closer to the slot bottom surface 76 than to the holder peripheral surface 72. The blade wedge angle theta may be greater than the acute slot wedge angle mu.
The cutting insert 22 is removably attached to the insert holder 24 by a fastening member 88. In accordance with some embodiments of the subject matter of the present application, the fastening member 88 may be a set screw located in the insert through bore 52 and threadedly engaged with the threaded slot 82. The insert through bore 52 and the threaded slot bore 82 may be eccentric with respect to each other such that a component of the clamping force may be directed rearwardly and downwardly.
In the assembled position of the cutting tool 20, the flute rear abutment surfaces 84 abut the rear peripheral abutment ridge 58, the flute lower abutment surfaces 86 abut the lower peripheral abutment ridge 60, and the flute side abutment surfaces 80 abut the insert inner side surface 28. More specifically, the groove-side abutment surface 80 abuts the three inner side abutment surfaces 56. According to some embodiments of the subject matter of the present application, the insert upper surface 38 can be spaced apart from the pocket peripheral wall surface 78. The bracket front end surface 70 may be aligned with the inboard transverse surface 46.
It should be noted that the peripheral contact between the cutting insert 22 and the insert holder 24 is not plane-to-plane. Rather, peripheral contact on the cutting insert 22 is formed on the rearward and lower peripheral abutment ridges 58, 60 with the outer and inner relief surfaces 64, 66 not contacting any portion of the pocket peripheral wall surface 78. Thus, the peripheral abutment region on the cutting insert 22 is essentially a line or band of contact with the slot-side abutment surface 80 on the insert pocket 26. Advantageously, by means of the abutment ridges 58, 60, the peripheral contact can be positioned in a precise predetermined position.
It is also noted that the peripheral contact on the insert pocket 26 is formed on the pocket rear abutment surface 84 and the pocket lower abutment surface 86, which are spaced from the holder peripheral surface 72. Thus, the force exerted by the cutting insert 22 is located at an inner portion of the holder peripheral surface 78, rather than an outer portion of the holder peripheral surface 78. The inner portion is more rigid and stronger than the outer portion, thus achieving a stronger connection between the cutting insert 22 and the insert holder 24.
By the aforementioned connection between the cutting insert 22 and the insert holder 24, the length L of the cutting portion can be increasedCA defined maximum depth of cut without the risk of increased vibration of the cutting portion 42, which may result in a reduced quality workpiece surface finish. For example, the cutting portion length LCMay be 15mm or more. This is particularly important when facing annular grooves of small diameter (for example, in the range of 10mm outer diameter) because of the cutting portion height HCIs limited in the end face undercut.
Although the subject matter of the present application has been described with a certain degree of particularity, it should be understood that various alterations and modifications could be made without departing from the spirit or scope of the invention as hereinafter claimed.

Claims (25)

1. A replaceable cutting insert (22) having a forward direction (D) defining an opposing directionF) And a backward direction (D)R) And further having an insert axial plane (P) containing the insert longitudinal axis (a), the cutting insert (22) comprising:
opposed insert inner and outer side surfaces (28, 30) and an insert peripheral surface (32) extending between the insert inner and outer side surfaces (28, 30), the insert peripheral surface (32) including opposed insert forward and rear end surfaces (34, 36) and opposed insert upper and lower surfaces (38, 40) connecting the insert forward and rear end surfaces (34, 36);
a cutting portion (42) including a major cutting edge (48) formed at an intersection of the insert nose surface (34) and the insert upper surface (38); and
a mounting portion (44) connected to the cutting portion (42) and including:
two peripheral abutment ridges (58, 60) spaced apart, located on a distal side of the insert outside surface (30) and extending along the insert rear end surface (36) and the insert lower surface (40), respectively, and in a rearward direction (D) of the cutting insert (22)R) Converging toward each other at an acute insert wedge angle (θ) upwardly away from the main cutting edge (48);
wherein each peripheral abutment ridge (58, 60) is located closer to the insert inside surface (28) than to the insert outside surface (30).
2. The cutting insert (22) according to claim 1, wherein:
an insert axial plane (P) passes between the insert inside surface (28) and the insert outside surface (30), and also passes through the main cutting edge (48); and is
Each peripheral abutment ridge (58, 60) lies in a ridge plane (P)R) Is parallel to the insert axial plane and is spaced from the insert axial plane by a constant ridge distance (D).
3. The cutting insert (22) according to claim 1, wherein, in a cross-section taken in a plane perpendicular to and passing through the longitudinal extension of each peripheral abutment ridge (58, 60), an imaginary tangent line (L) tangent to the peripheral abutment ridge (58, 60) forms an acute internal ridge angle (a) with the insert inside surface (28).
4. The cutting insert (22) according to claim 3, wherein the imaginary tangent line (L) does not intersect any other point on the insert peripheral surface (32).
5. The cutting insert (22) according to claim 1, wherein each peripheral abutment ridge (58, 60) is convexly curved in a direction from the insert inside surface (28) to the insert outside surface (30).
6. The cutting insert (22) according to claim 5, wherein:
each peripheral abutment ridge (58, 60) is defined by an imaginary cylinder having a ridge radius (R); and is
The ridge radius (R) is within the range of R being more than or equal to 0.25mm and less than or equal to 0.75 mm.
7. The cutting insert (22) according to claim 1, wherein:
each peripheral abutment ridge (58, 60) is spaced from the insert outboard surface (30) by an outer relief surface (64); and is
The outer relief surface (64) is planar and inclined outwardly in a direction from the insert outer side surface (30) toward the insert inner side surface (28).
8. The cutting insert (22) according to claim 7, wherein the outer relief surface (64) forms an acute, inner outer relief angle (β) with the insert inside surface (28), the outer relief angle (β) being in the range of 60 ° ≦ β ≦ 65 °.
9. The cutting insert (22) according to claim 1, wherein:
each peripheral abutment ridge (58, 60) is spaced from the insert inner side surface (28) by an inner relief surface (66); and is
The inner relief surface (66) is planar.
10. The cutting insert (22) according to claim 1, wherein each peripheral abutment ridge (58, 60) extends to an insert inner side surface (28).
11. The cutting insert (22) according to claim 1, wherein:
the insert inner side surface (28) includes an inner lateral surface (46) extending midway along and oriented transverse to the insert longitudinal axis (a) between the insert upper surface (38) and the insert lower surface (40), the inner lateral surface (46) defining a cutting portion (42) and a mounting portion (44).
12. The cutting insert (22) according to claim 1, wherein the mounting portion (44) includes an insert through bore (52) passing through the insert inside surface (28) and the insert outside surface (30) along a through bore axis (T).
13. The cutting insert (22) according to claim 1, wherein, in a top view of the cutting insert (22):
the mounting portion (44) has a mounting portion width (W) measured in a direction perpendicular to the insert axial plane (P)M）；
The cutting portion (42) has a cutting portion width (W) measured in a direction perpendicular to the insert axial plane (P)C) (ii) a And is
Cutting part width (W)C) Less than the width (W) of the mounting portionM）。
14. The cutting insert (22) according to claim 1, wherein, in a top view of the cutting insert (22):
the mounting portion (44) has a mounting portion length (L) measured along the blade longitudinal axis (A)M）；
The cutting portion (42) has a cutting portion length (L) measured along the insert longitudinal axis (A)C) (ii) a And is
Cutting part length (L)C) Greater than the length (L) of the mounting portionM）。
15. The cutting insert (22) according to claim 1, wherein the insert inside surface (28) includes three spaced apart insert protrusions (54) projecting therefrom at the mounting portion (44), each insert protrusion (54) including an inside abutment surface (56), the inside abutment surfaces (56) being coplanar with one another.
16. The cutting insert (22) according to claim 1, wherein at the cutting portion (42), the insert inside surface (28) and the insert outside surface (30) are curved in a front view of the cutting insert (22).
17. The cutting insert (22) according to claim 1, wherein:
a forward portion (38 a) of the insert upper surface (38) is in a forward direction (D)F) Inclined upwards towards the blade longitudinal axis (a); and is
The main cutting edge (48) is arranged in the height direction (H) of the cutting part (42)C) Is located in a middle portion of the cutting insert (22).
18. The cutting insert (22) according to claim 1, wherein the mounting portion (44) is devoid of any abutment surfaces on the insert front end surface (34) and the insert upper surface (38).
19. The cutting insert (22) according to claim 1, wherein:
the cutting insert (22) includes a mounting portion outer peripheral ridge (62) located on a distal end side of the insert outside surface (30) and continuously extending in an outer peripheral direction along an entire insert outer peripheral surface (32) of the cutting insert (22) at the mounting portion (44); and is
Two peripheral abutment ridges (58, 60) are formed on the mounting portion outer peripheral ridge (62).
20. A cutting tool (20) comprising, in combination:
a blade holder (24) having a holder longitudinal axis (B); and
the cutting insert (22) according to claim 1, removably attached to an insert holder (24) by a fastening member (88).
21. The cutting tool (20) according to claim 20, wherein:
the insert inside surface (28) includes three spaced apart insert protrusions (54) projecting therefrom at the mounting portion (44), each insert protrusion (54) including an inside abutment surface (56);
the two peripheral abutment ridges (58, 60) including a rear peripheral abutment ridge (58) on the insert rear end surface (36) and a lower peripheral abutment ridge (60) on the insert lower surface (40); and is
The blade holder (24) comprises:
a stent forward end surface (70) and a stent outer peripheral surface (72) forming a circumferential boundary thereof; and
an insert pocket (26) recessed into the holder peripheral surface (72) and comprising:
a slot opening (74) that opens toward the bracket front end surface (70); and
a slot floor surface (76) and a slot peripheral wall surface (78) oriented substantially perpendicular to the slot floor surface (76), the slot floor surface (76) including a slot side abutment surface (80), and the slot peripheral wall surface (78) including a slot rear abutment surface (84) and a slot lower abutment surface (86), the slot rear abutment surface (84) and the slot lower abutment surface (86) sloping outwardly in a direction from the bracket peripheral surface (72) towards the slot floor surface (76) and converging towards each other at an acute slot wedge angle (μ) in a direction away from the slot opening (74); wherein in the assembled position of the cutting tool (20):
the lower groove abutment surface (86) abuts the lower outer peripheral abutment ridge (60), the rear groove abutment surface (84) abuts the rear outer peripheral abutment ridge (58), and the groove side abutment surface (80) abuts the insert inner side surface (28).
22. The cutting tool (20) according to claim 21, wherein:
the lower and rear slot abutment surfaces (86, 84) are closer to the slot bottom surface (76) than to the bracket peripheral surface (72).
23. The cutting tool (20) according to claim 21, wherein:
the mounting portion (44) includes an insert through bore (52) passing through the insert inside surface (28) and the insert outside surface (30) along a through bore axis (T);
the trough bottom surface (76) includes a threaded slot (82); and is
The fastening member (88) is a set screw located in the insert through bore (52) and threadedly engaged with the threaded slot bore (82).
24. The cutting tool (20) according to claim 21, wherein the insert upper surface (38) is spaced apart from the pocket peripheral wall surface (78).
25. The cutting tool (20) according to claim 21, wherein the insert wedge angle (Θ) is greater than the acute slot wedge angle (μ).
CN201880021122.5A 2017-03-29 2018-03-08 Cutting insert with two peripheral abutment ridges and cutting tool Active CN110505933B (en)

Applications Claiming Priority (3)

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US15/472,653 2017-03-29
US15/472,653 US10239123B2 (en) 2017-03-29 2017-03-29 Cutting insert having two peripheral abutment ridges and cutting tool
PCT/IL2018/050270 WO2018178968A1 (en) 2017-03-29 2018-03-08 Cutting insert having two peripheral abutment ridges and cutting tool

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CN110505933B true CN110505933B (en) 2021-10-01

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EP (1) EP3600733B1 (en)
JP (1) JP7113835B2 (en)
KR (1) KR102464859B1 (en)
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BR (1) BR112019020042B1 (en)
CA (1) CA3056994A1 (en)
ES (1) ES2932349T3 (en)
IL (1) IL268581B2 (en)
PL (1) PL3600733T3 (en)
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PT3600733T (en) 2022-12-16
RU2019125126A3 (en) 2021-05-27
PL3600733T3 (en) 2023-03-27
IL268581B1 (en) 2023-04-01
TW201836740A (en) 2018-10-16
KR20190136020A (en) 2019-12-09
EP3600733A1 (en) 2020-02-05
TWI752150B (en) 2022-01-11
CA3056994A1 (en) 2018-10-04
ES2932349T3 (en) 2023-01-18
WO2018178968A1 (en) 2018-10-04
KR102464859B1 (en) 2022-11-08
EP3600733B1 (en) 2022-11-16
IL268581A (en) 2019-09-26
US20180281075A1 (en) 2018-10-04
BR112019020042B1 (en) 2022-12-20
BR112019020042A2 (en) 2020-04-28
CN110505933A (en) 2019-11-26
JP7113835B2 (en) 2022-08-05
US10239123B2 (en) 2019-03-26
IL268581B2 (en) 2023-08-01
RU2750391C2 (en) 2021-06-28
RU2019125126A (en) 2021-04-29

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